Is it really necessary to tell a bedtime story for your kid?

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When I was a child my mom always tell bedtime story for me. I remembered most of them but now I've found out that not all of them are true. For example there isn't a creature like little mermaid in a real world. So, do you think is it really necessary to tell such kind a story for our kids? What kind of bed time story that's OK for a child?